hi I am a singer and I wanted to tell you what I use when singing and have to lubricate... I recommend a powder which has soothed and rehydrated and coated my larynx every single time i have used it...
SLIPPERY ELM powder... you have to make a paste with it and slowly blend it with hot/ warm water (pre boiled) ... it turns into a gloopy paste and is quite indigestable at first... but I have come to rely on it. available in all natural health stores.. and works miracles...
I too have experianced what you have experianced and its a real shock but completely ok... just your voice reminding you to drink more water and have plenty of non-straining voice time... ie...no shouting at the kids... or whispering... and get enough sleep...